8results about How to "Wide pH range" patented technology

This invention discloses a method for preparing FeZn-LDH nanosheets and their application in glucose colorimetric detection, belonging to the field of nanoenzyme technology. The preparation method involves introducing arginine and L-histidine into an Fe / Zn metal salt system and combining this with microwave-induced heating to prepare FeZn-LDH nanosheets. The prepared FeZn-LDH nanosheets effectively prevent LDH aggregation, resulting in a thinner, two-dimensional FeZn-LDH nanosheet structure with a larger specific surface area, thereby improving the peroxidase-like catalytic activity and glucose colorimetric detection performance of the material.

The invention discloses a method for removing polymorphic inorganic phosphorus, and belongs to the technical field of environmental material preparation and application. The method comprises the following steps: adding a biomass-based modified iron-based organic framework composite material and an oxidizing agent into the nickel-containing electroplating wastewater, oscillating and adsorbing at normal temperature, and removing polymorphic inorganic phosphorus in the nickel-containing electroplating wastewater; wherein the polymorphic inorganic phosphorus comprises phosphate, phosphite and nickel complex phosphite. The biomass-based modified iron-based organic framework composite material prepared by the invention can realize complex breaking adsorption of a heavy metal-phosphorous acid complex, oxidative adsorption of phosphite and adsorption of orthophosphate in electroplating wastewater in one step, and has the maximum adsorption capacities of 2.26 mmol / g, 1.89 mmol / g and 2.77 mmol / g on phosphate, phosphite and nickel complex phosphite respectively; in practical application, the loss amount does not exceed 3%, and the applicable pH range is wide.

A multi-barrier coupled treatment process for organic complexed heavy metals in wastewater from battery cathode material production is disclosed, relating to the field of wastewater treatment. The method involves: 1. Adjusting the pH of the wastewater to 3.0-4.5; 2. Adding iron salt and peracetic acid to an oxidation reaction tank; 3. Achieving primary removal of heavy metals through neutralization and precipitation after oxidation; 4. Adjusting the pH of the wastewater back to 6.0-6.5; 5. Passing the wastewater sequentially through a primary adsorption unit and a secondary adsorption unit. This invention utilizes the low bond energy characteristics of PAA and the synergistic oxidation advantages of multiple free radicals to solve the bottleneck problems of incomplete complex breaking, large sludge production, and narrow pH application range in traditional methods. After treatment by this invention, the total nickel concentration in the effluent is less than 0.05 mg / L, and the total cobalt concentration is less than 0.02 mg / L, consistently exceeding the limits of the "Emission Standard of Pollutants for Battery Industry" (GB 30484-2013), demonstrating broad industrial application prospects.

This utility model discloses a microwave-coupled Fenton catalytic oxidation system for treating recalcitrant organic wastewater, belonging to the field of wastewater treatment technology. It includes a reactor tank with an inlet pipe at the bottom and an outlet pipe at the top on one side. A circulation pipe is located on the other side, connected to a hydrogen peroxide storage tank via a hydrogen peroxide pipe. A ferrous pipe is installed above the inlet pipe, connected to a ferrous storage tank. A microwave generator is mounted on the top of the reactor tank, connected to a microwave transmitting antenna, which is protected by a PP sleeve. A pH meter and a temperature sensor are installed on both sides of the microwave generator and on the top of the reactor tank. The treated wastewater is mixed with hydrogen peroxide and introduced into the reactor tank through the circulation pipe, preventing the hydrogen peroxide from being prematurely consumed by mixing with highly concentrated wastewater. The temperature sensor reading is compared with a set temperature, and a PLC controller controls the microwave generator to reduce or stop irradiation, preventing excessively high temperatures from accelerating the Fenton side reaction.

The invention relates to a method for preparing an attapulgite-activated carbon composite material from natural attapulgite, which specifically comprises the following steps: by taking the natural attapulgite as a raw material, adding a certain amount of acid, a suspending agent and water according to mass fraction, stirring at normal temperature, washing, drying and crushing to obtain purified attapulgite, and drying to obtain the attapulgite-activated carbon composite material. Then adsorbing coked stronger ammonia water by using purified attapulgite, filtering and drying the adsorbed attapulgite, and performing oxygen-isolated calcination in a tubular furnace to obtain the attapulgite-activated carbon composite material. Oil substances adsorbed on the surface of the attapulgite adsorbed with strong ammonia water are used as a carbon source of activated carbon and are converted into a mesoporous activated carbon material with adsorption capacity through a one-step calcination method, and meanwhile, the pore structure of the attapulgite is also dredged under the action of acid. According to the invention, the adsorption and oil removal of the coked stronger ammonia water by the attapulgite are realized, the adsorbed oil substances are further utilized to generate the activated carbon, the adsorption performance of the attapulgite and the activated carbon is fully utilized, and the obtained product has high adsorption capacity, good thermal stability and better application prospect.

The invention discloses a La-doped oxygen vacancy-containing La-MIL88B (Fe) bimetal organic framework material as well as a preparation method and an application of the La-doped oxygen vacancy-containing La-MIL88B (Fe) bimetal organic framework material. The preparation method comprises the following steps: mixing and dissolving ferric chloride hexahydrate, lanthanum chloride heptahydrate and terephthalic acid in an organic solvent, and then carrying out solvothermal reaction to obtain the oxygen vacancy-containing bimetallic La-MIL88B (Fe) organic framework material. The material is the material prepared by the method. According to the application, the materials are adopted to remove phosphate in water in a static adsorption and / or dynamic adsorption mode. The preparation method disclosed by the invention is simple and low in cost, and the prepared La-MIL88B (Fe) material can be used for removing phosphate in water and has the characteristics of high dynamic adsorption capacity, relatively high adsorption rate, high selectivity, wide pH application range and the like.

The application relates to the technical field of wastewater treatment, and discloses a method for rapidly degrading phenol by using iron in phenol-containing wastewater, wherein safe and nontoxic cysteine is selected as a reaction initiator, and meanwhile, reduction and complexation are realized, so that the reaction is rapidly started, and the pH range of a traditional Fenton reaction is widened; Cu 2+ is selected as a reaction intensifier, Fe 3+ / Fe 2+ circulation is accelerated, phenol is rapidly degraded, and the degradation of other organic pollutants is synergistically improved; without preparing and adding complex and high-cost iron-containing activators, a small amount of iron contained in the wastewater is used as a Fe 2+ source, and recycling is formed in the system, so that the pollutant removal speed is greatly improved, and the generation of iron sludge is reduced. The technology has the advantages of being green, efficient, simple to operate and low in cost.

The application provides a paint residue derived activated carbon coated cobalt nanomaterial and a preparation method and application thereof, the preparation method in the application uses solid hazardous waste paint residue as raw material, and adsorbs metal cobalt ions on the paint residue; the cobalt ion-paint residue compound is calcined and pyrolyzed, a magnetic Co-AC catalyst is obtained, and the catalyst is applied to catalytic activation of peroxymonosulfate to degrade new organic pollutants in water. The paint residue derived activated carbon coated cobalt nanomaterial in the application can be used as a green and efficient heterogeneous Fenton-like catalyst, peroxymonosulfate is activated through a non-free radical pathway, and the catalyst is easy to separate and reuse under an external magnetic field.